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ERECTION/ FIXING/ JOINTING

610 INSTALLATION INSTRUCTIONS PROVIDED BY MANUFACTURER
• Information: Provide clear and comprehensive instructions and ensure that they
are understood by the site operatives.

630 ACCURACY OF ERECTION
• Supporting structure: Before commencing installation of precast panels, carry out
survey sufficient to verify that required accuracy of erection can be achieved.
- Give notice: If the structure will not allow the required accuracy or security of
erection.
• Joint centres: Set out to ensure consistent joint widths.
• Joint width: Within the length of any joint, including those interrupted by transverse
joints, to vary by not more than 10% or nominal joint width.
- Variations: Evenly distributed with no sudden changed.
- General: Within recommendations of joint sealant of baffle manufacturer.
• In-line edges in elevation: Deviation across transverse joint to vary by not more
than 10% or nominal joint width.
• Flat faces of adjacent panels: Offset in plan or section across any joint to vary by
not more than 10% or nominal joint width.
• Finished appearance: Notwithstanding tolerances stated above and in clause 420,
panels must be square, regular, true to line, level and plane with a satisfactory fit at
junctions.

640 FINAL FIXING
• Approval of appearance: Obtain for each elevation prior to tightening fasteners,
filling bed joints and dowel sockets or sealing joints.
• Threaded fasteners: Tighten to torque figures recommended by manufacturer.
- Restraint fixings permitting lateral movement: Do not overtighten.
• Filling for dowel bars and recessed lifting devices: Well tamped fairly dry 1:4
cement:sand or suitable epoxy or polyester mix.

650 MORTAR BEDDING TO PANELS ON SUPPORT STRUCTURE
• Condition of surfaces: Clean.
• Cavity adjoining bedding: Free of mortar.
• Bed joint: Fully filled with dry 1:3 cement:sand mix. Well compacted.

670 OPEN DRAINED JOINTS
• Rear seals: Airtight and watertight.
• Baffles and flashings: Securely installed.

RotF generic (intermediate) NBS 2014 6118-AEW-XX-XX-NBS-A-01